2218342921 has 2 divisors, whose sum is σ = 2218342922. Its totient is φ = 2218342920.

The previous prime is 2218342913. The next prime is 2218342949. The reversal of 2218342921 is 1292438122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2147024896 + 71318025 = 46336^2 + 8445^2 .

It is a cyclic number.

It is not a de Polignac number, because 2218342921 - 2³ = 2218342913 is a prime.

It is not a weakly prime, because it can be changed into another prime (2218142921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1109171460 + 1109171461.

It is an arithmetic number, because the mean of its divisors is an integer number (1109171461).

Almost surely, 2^2218342921 is an apocalyptic number.

It is an amenable number.

2218342921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2218342921 is an equidigital number, since it uses as much as digits as its factorization.

2218342921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 34.

The square root of 2218342921 is about 47099.2879033219. The cubic root of 2218342921 is about 1304.1960905587.

The spelling of 2218342921 in words is "two billion, two hundred eighteen million, three hundred forty-two thousand, nine hundred twenty-one".